Professional C# and .NET, 2021st Edition

19Networking

WHAT'S IN THIS CHAPTER?

• Manipulating IP addresses and performing DNS lookups
• Using socket programming
• Creating TCP and UDP clients and servers
• Using HttpClient
• Working with the HttpClient factory

CODE DOWNLOADS FOR THIS CHAPTER

The source code for this chapter is available on the book page at www.wiley.com. Click the Downloads link. The code can also be found at https://github.com/ProfessionalCSharp/ProfessionalCSharp2021 in the directory 2_Libs/Networking.

The code for this chapter is divided into the following major examples:

• Utilities
• Dns
• SocketServer
• SocketClient
• TcpServer
• TcpClientSample
• UdpReceiver
• UdpSender
• HttpServerSample
• HttpClientSample

Samples from this chapter use the System.Net, System.Net.Sockets, System.Net.Http, and System.IO.Pipelines namespaces. Important NuGet packages used are Microsoft.Extensions.Http and Microsoft.Extensions.Hosting. All the samples have nullable reference types enabled.

OVERVIEW

This chapter takes a practical approach to networking by mixing examples with a discussion of relevant theory and networking concepts as appropriate. This chapter is not a guide to computer networking but an introduction to using .NET for network communication.

This chapter shows you how to create both clients and servers using network protocols. It starts with utility classes such as IPAddress, IPHostEntry, and Dns before digging into programming with sockets. Here, sockets are used to show the functionality of communication ...